Cisco Small Business Series Switches Session Credentials Replay (CVE-2021-34739)

high Tenable OT Security Plugin ID 502848

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the web-based management interface of multiple Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to replay valid user session credentials and gain unauthorized access to the web-based management interface of an affected device. This vulnerability is due to insufficient expiration of session credentials. An attacker could exploit this vulnerability by conducting a man-in-the-middle attack against an affected device to intercept valid session credentials and then replaying the intercepted credentials toward the same device at a later time. A successful exploit could allow the attacker to access the web-based management interface with administrator privileges.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 502848

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 2/13/2025

Updated: 2/19/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-34739

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:cbs350-24fp-4g_firmware, cpe:/o:cisco:cbs350-24s-4g_firmware, cpe:/o:cisco:cbs350-12xs_firmware, cpe:/o:cisco:cbs350-24p-4g_firmware, cpe:/o:cisco:cbs350-48fp-4g_firmware, cpe:/o:cisco:cbs350-8mgp-2x_firmware, cpe:/o:cisco:cbs350-8t-e-2g_firmware, cpe:/o:cisco:cbs250-8p-e-2g_firmware, cpe:/o:cisco:cbs350-24mgp-4x_firmware, cpe:/o:cisco:cbs350-48fp-4x_firmware, cpe:/o:cisco:cbs250-8t-d_firmware, cpe:/o:cisco:cbs350-12xt_firmware, cpe:/o:cisco:cbs250-8fp-e-2g_firmware, cpe:/o:cisco:cbs250-48p-4x_firmware, cpe:/o:cisco:cbs250-48pp-4g_firmware, cpe:/o:cisco:cbs350-24t-4x_firmware, cpe:/o:cisco:cbs350-16t-e-2g_firmware, cpe:/o:cisco:cbs250-24p-4x_firmware, cpe:/o:cisco:cbs350-24xts_firmware, cpe:/o:cisco:cbs350-8s-e-2g_firmware, cpe:/o:cisco:cbs350-48t-4g_firmware, cpe:/o:cisco:cbs250-16p-2g_firmware, cpe:/o:cisco:cbs350-24fp-4x_firmware, cpe:/o:cisco:cbs350-16p-e-2g_firmware, cpe:/o:cisco:cbs350-48xt-4x_firmware, cpe:/o:cisco:cbs250-8t-e-2g_firmware, cpe:/o:cisco:cbs250-48t-4g_firmware, cpe:/o:cisco:cbs250-24t-4x_firmware, cpe:/o:cisco:cbs350-8fp-2g_firmware, cpe:/o:cisco:cbs250-8pp-e-2g_firmware, cpe:/o:cisco:cbs350-48ngp-4x_firmware, cpe:/o:cisco:cbs350-48p-4g_firmware, cpe:/o:cisco:cbs350-8p-2g_firmware, cpe:/o:cisco:cbs350-16t-2g_firmware, cpe:/o:cisco:cbs350-8fp-e-2g_firmware, cpe:/o:cisco:cbs250-24fp-4g_firmware, cpe:/o:cisco:cbs350-16fp-2g_firmware, cpe:/o:cisco:cbs250-24t-4g_firmware, cpe:/o:cisco:cbs350-8mp-2x_firmware, cpe:/o:cisco:cbs350-12np-4x_firmware, cpe:/o:cisco:cbs350-48t-4x_firmware, cpe:/o:cisco:cbs250-16t-2g_firmware, cpe:/o:cisco:cbs350-24ngp-4x_firmware, cpe:/o:cisco:cbs350-16xts_firmware, cpe:/o:cisco:cbs250-48p-4g_firmware, cpe:/o:cisco:cbs250-24pp-4g_firmware, cpe:/o:cisco:cbs350-8p-e-2g_firmware, cpe:/o:cisco:cbs350-8xt_firmware, cpe:/o:cisco:cbs250-48t-4x_firmware, cpe:/o:cisco:cbs350-48p-4x_firmware, cpe:/o:cisco:cbs350-24xs_firmware, cpe:/o:cisco:cbs250-24fp-4x_firmware, cpe:/o:cisco:cbs350-24xt_firmware, cpe:/o:cisco:cbs350-16p-2g_firmware, cpe:/o:cisco:cbs250-8pp-d_firmware, cpe:/o:cisco:cbs350-24p-4x_firmware, cpe:/o:cisco:cbs350-24t-4g_firmware, cpe:/o:cisco:cbs250-24p-4g_firmware

Required KB Items: Tenable.ot/Cisco

Exploit Ease: No known exploits are available

Patch Publication Date: 11/4/2021

Vulnerability Publication Date: 11/4/2021

Reference Information

CVE: CVE-2021-34739

CWE: 613

Detections

Analytics